Infrastructure System Overview
 National Semiconductor offers a wide range of high performance signal path solutions for wireless basestation (BTS) and wireless infrastructure applications in 2G, 2.5G, 3G and 4G mobile telephony, microwave backhaul and smart antenna systems. With many 2G and 2.5G (GSM / GPRS / EDGE / cdmaOne / IS-95, PDC, PCS and iDEN) systems continuing to expand and mature the direction is for more complete and highly power efficient solutions enabled by National Semiconductor’s PowerWise products including data converters (ADC and DAC), high-speed amplifiers, timing and clocking solutions and power management products. As 3G systems have evolved (UMTS to HSDPA, HSUPA, HSPA, HSOPA; cdmaONE to cdma2000 1xRTT, EV-DO, EV-DV) and as new systems have been developed (TD-SCDMA, smart antenna and MIMO installations, WiMAX, WiBro, 802.16) to provide higher data speeds and higher voice capacity the push has been for higher performance signal path solutions with a similar focus on energy efficiency. Developments in the 4G area of OFDMA and Long Term Evolution (LTE) are driving the need for National Semiconductor’s new power efficient, high performance signal path and power conversion solutions. Whether the radio is integrated in the basestation or a remote radio head (RRH) is connected via a specialized interface set by the CPRI, OBSAI, or Ethernet (with IEEE-1588) standard, National Semiconductor provides high speed data interface solutions with gigasample per second (GSPS) data rates and milliwatt power consumption.
Click here to view the Wireless Base Station Infrastructure Solutions Diagram.
PowerWise® High Speed Amplifiers, ADCs and Timing Devices
|
 Video (5 mins):
Watch as National Semiconductor's Rick Zarr takes you through some of the latest innovations that National is announcing to help solve designers' analog problems, including a demonstration of an evaluation and reference design board that combines a number of National’s industry-leading I-C’s into one valuable reference design.
|
|
|
|
Video (16 mins):
Overview on Energy-Efficiency, and New High-Speed Amplifiers. View online
|
|
|
Design Tools
Communications Infrastructure Solutions Guide: A comprehensive guide to National's solutions for base stations and other comms infrastructure systems.
Signal-Path Designer® #111 (pdf)
Selecting Amplifiers, ADCs, and Clocks for High-Performance Signal Paths.
Application Notes:
- AN-1558 - Clocking High-Speed A/D Converters
- AN-1704 - High-Speed ADC Input Driver
- AN-1716 - Driving High-Speed ADCs
- AN-1718 - Diff Amp Apps Up to 400 MHz
- AN-1719 - Noise Analysis - Fully Diff. Amp
- AN-1721 - High-Speed ADCs - Interfacing, Driving, and Clocking
- AN-1950 - Silently Powering Low-Noise Applications
Reference Designs:
| The reference designs include ADCs, front-end amplifiers, timing components, and power supply regulation. |
 |
|
 |
Low IF Receiver System with 16-bit 130 MSPS ADC16V130, LMK04031B, LP5900, LP3878
- Small-signal (-20 dBFS) SNR of 78 dBFS and SFDR > 94 dBFS
- Large-signal (-1 dBFS) SNR of 75.8 dBFS and SFDR > 84 dBFS
- Total integrated jitter < 250 fs
- Watch video overview
|
 |
High IF Receiver System with 14-bit 155 MSPS ADC14V155, LMH6515, LMK03001C
- Reference design performance for a 169 MHz input signal
- Small-signal SNR of 72 dBFS and SFDR > 90 dBFS
- Large-signal SNR 68.3 dBFS and SFDR of 77 dBFS
|
 |
Low IF Receiver System with Dual 14-bit 105 MSPS ADC14DS105, LMH6552, LMK02000
- Reference design performance for input signals up to 40 MHz
- Small-signal SNR of 74 dBFS and SFDR greater than 90 dBFS
- Large-signal SNR of 73.3 dBFS and SFDR greater than 85 dBFS
|
Featured Sites:
|
